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​Present, in correct order, the four stages by which attachment develops between a child and caregiver. Note what happens at each stage, and the typical ages of each stage.

​A child’s ability to move around in the world is referred to as

Which of the following is a drawback associated with sequential studies?

By the time a baby reaches his first birthday, he will spend about 25% of its sleep time in _______________ sleep, which is similar to sleep patterns of an adult.

​Monroe wants to conduct a research study assessing the way children play with each other at different ages. After getting the appropriate permissions, he sits on a bench near a school playground and surreptitiously takes notes on the children’s behaviors. Monroe would be best described as engaging in

​Research consistently finds that fathers and mothers treat their children differently based on the child’s sex. Which statement accurately explains some of this variance?

​One of the main challenges of a cross-sectional research is the appearance of _______________ effects, which refer to differences between age groups that are caused by environmental, rather than developmental, factors.

​Lev _______________ believed that development is essentially an apprenticeship in which children develop as they work alongside skilled adults, including their parents and teachers.

​A child who is born at a weight of less than 1000 grams would be referred to as having _______________ birth weight.

​Which of the following underlies the process of operant conditioning?